Coaster bicycle-brake.



No. 719,118. PATENTED JAN. 27, 1903.

J. HURGK. GOASTER BICYCLE BRAKE.

APPLICATION FILED NOV. 18, 1901.

N0 MODEL.

' 3 SHEBTBSHB ET 1.

Eg /re 8 fire 3 I so Q $0,719,118. PATENTEDV JAN. 27, 1903;

J. HURGK.

GOASTBR BIGYGLE BRAKE.

APPLICATION FILED NOV. 18, 1901. I

I0 IODEL. 3 SHEETS-SHEET 2.

3; f v I 1 5 33 No. 719,118. PATENTED JAN. 27, 903.

v J. HURGK.

OOASTER BICYCLE BRAKE.

APPLICATION FILED NOV. 18, 1901. H0 MODEL. 3 SHEETS-SHEET 3.

W I M C (MM-1 By A44 A TTORNE V lluurnn Frames JOHN HURCK, OF ST. LOUIS,MISSOURI.

COASTER BlCYCLE BRAKE.

SPECIFICATION forming part of Letters Patent No. 719,118, dated January2'7, 1903. Application filed November 18, 1901. Serial No. 82,613. (Nomodel.)

To ctZZ whom 1 may concern.-

Be it known that 1, JOHN HUROK, a citizen of the United States, residingat St. Louis, in the State of Missourhhave invented certain new anduseful Improvements in Coaster Bicycle-Brakes, of which the followingisa full, clear, and exact description, suchas will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to brakes for bicycles, automobiles, or othervehicles, and has for its object to provide a brake which will operatecertainly and in a positive manner. It is adapted to be used inconnection with bicycles or automobiles of ordinary construction, and itwill be hereinafter fully described and the features of novelty pointedout in the appended claims.

Reference is to be had to the accompanying drawings, forming part ofthis specification,

in which similar figures of reference denote like parts in all thefigures.

Figure 1 is a side elevation of a bicycle. Fig. 2 is a perspective viewshowing the relation of the most important parts of my device whenassembled and in the braking position. Fig. 3 is a view of the movablering 28 with the spring carried thereby. Fig. 4 is a side view of analternative form of construction of the movable ring 28, showing thespring borne thereby of a different shape and carried upon the oppositeside of ring 28 from that shown in Fig. 3. Fig.5 is a perspective viewof the hollow cylinder through which the axle passes located at the endopposite to the rear sprocket-wheel and showing in position thereon thespring 37. Fig. 6 is a detail of the nut 47. Fig. 7 is a perspectiveview of the barrelor hub, showing the interior threads at one endthereof. Fig. 8 is a perspective view of the cup-shaped nut containingthe fe male friction-cone. Fig. 9 is an end view of the small end of themale friction-cone. Fig. 10 is an end view of the large and serrated endof the same. Fig. 11 is a perspective view of the same, showing theserrations, the interior threads, and interior grooves. Fig. 12 is aperspective view of the rear sprocket-wheel and threaded spindle. Fig.13 is a detail in perspective of the nut and journal against which saidsprocket-wheel bears on its outer side. Fig.1 lisaperspective viewoft-he serrated ring and ball-bearings againstwhich said sprocket bearson its opposite side. Fig. 15 is a perspective view of the movablemember which engages at will either indirectly the propelling mechanismordirectly the braking mechanism. Fig. 16 is an end view of the hollowthreaded spindle and a side view of ring 25. Fig. 17 is a centrallongitudinal sectional View taken-longitudinally through the center ofFig. 2.

In the said drawings, 1 designates the front wheel of a bicycle; 2, thefork; 3, the handlebar; 4, the frame; 5, the rear fork; 6, the rearwheel; 7, its shaft or axle; 8, the saddle; 9, the driving-sprocket; 10,the cranks; 11, the pedals, and 12 the sprocket-chain connected with thesprocket 13, loosely mounted on the axle of the rear wheel 6. Theseparts may be of any ordinary or suitable construction and form no partof the present invention.

Mounted to revolve on the shaft or axle 7 and surrounding same is thedriving-Wheel 6. The spokes of this wheel are attached to the barrel orhub 14 in the usual manner by means of the perforations 54 in theannular flanges thereof. The barrel or hub incloses all the partscomposing the brake itself, as well as the member hereinafter described,which acts, with'the rear sprocketwheel 13, to drive the Wheel 6. Therear sprocket-wheel 13 is located adjacent but exterior to said barrelor l1 ub 14. One end of axle 7 passes through the opening 15 in saidsprocket 13, which revolves loosely around that end of the axle. A nut16 at the end of said axle 7, but within the fork 5, holdsantifriction-balls 17 between it and the cup 18, provided in the recess19 near the'center of the outer face of said sprocket-wheel. Thesprocket-wheel 13 is mounted upon a hollow spindle 20, through the boreof which the axle 7 passes. The spindle 20 and thesprocket 13, securedthereto, are thus borne by the axle 7. The spindle 20 has a cone 21,upon which antifriction-balls 22 roll, said balls being arranged in thecup 23 within the dished recess 24 in the ring 25, whereby the frictionbetween the said spindle and ring is reduced to a minimum. The uses ofthis ring will be hereinafter described.

The spindle 20 has screw-threads 26, which cooperate with correspondingthreads 27 in side the ring or movable member 28, and the cooperation ofthese threads 26 and 27 causes said ring 28 to move to the right or tothe left, as will be hereinafterdescribed. The threads 26 on the spindlemay be of any desired length or form; but I have shown them eX- tendingapproximately from the cone 21 to a point adjacent to the inner end ofsaid spindle. The diameter of said spindle I ha\'e,however, shownreduced near its inner end, as at 29. The ring 28 has a spring 56located between it and the ring 25, with an interior annular flange 57,of which its end is adapted to engage. In the drawings I have shown thisspring attached to and carried by ring 28. In Fig. 3 of the drawings Ihave shown a modified arrangement of this spring, in which instead ofbeing located on the side of the movable member 2.8 nearest thesprocketwheel and bearing against the flange 57itappears upon theopposite side of said movable member 28, and its end 58 is curvedfarther inward, so as to be adapted to strike against the end 59 of thespindle 20. However constructed 'or arranged, the function of thisspring is to tend to keep the serrations on ring 28 out of engagementwith those on ring 25.

The axle 7 has surrounding the same the member 30, which is cup-shapedand has its interior partially, at least, concavely shaped, so as toform a female friction-surface 31. The male friction-cone 32 is mountedupon the axle 7 and in a manner making it capable of longitudinalmovement thereon in order that it may at times coact with thefriction-surface 31 and at others remain inactive borne by said axle 7.The male friction-cone is mounted upon the axle in the following manner.The axle 7 is externally screwthreaded at its ends, as at 33. Screwed asuitable distance in upon said axle 7 is a hollow cylinder 34,exteriorly screw-threaded at its inner end 35 and provided with bearingfins or projections 36, formed integral with the said cylinder adjacentits inner end. 37 indicates a coiled spring encircling the said hollowcylinder 34 and being arranged be tween the said projections 36 and theshoulder 41 of the nut 38, said nut being provided with shoulders 39, ofwhich the clamp takes hold. The latter being attached at its other endto the frame 4 prevents said nut 38 and the hollow cylinder 34, uponwhich same is formed, from rotating. The nut '38 has a shoulder 41,which has attached thereto or formed integral therewith a cone 42,between which and the recessed end 43 of the cup-shaped nut 30 arelocated balls 44. The male friction-cone has a longitudinal opening 45through its center and surrounds the hollow cylinder 34 and has grooves40 formed within said longitudinal opening 45, into which the fins orprojections 36 fit, thus preventing the rotation of said malefrictioncone, but admitting of longitudinal movement of the same. Thislongitudinal movement is limited in one direction by the threaded ringor nut 47, which screws upon the threaded end portion 35 of the hollowcylinder 34 and abuts against the flange 62 within the cone. The malefriction-cone 32 is normally kept out of engagement with thefriction-surface 31 by the spring 37, (which is coiled spring, but maybe of any other variety,) which bears against the inner end 48 of saidmale friction-cone 32. The longitudinal movement of the malefriction-cone 32 in this direction is limited only by the strongestpossible frictional contact with the female friction-surface 31. Suchfrictional contact is for braking purposes and is primarily produced bythe interlocking of the serrated edge 49 of said male friction-cone andthe adjacent serrated edge 50 of the threaded ring 28. In thelongitudinal movement for such braking purposes the ring 28 pushes themale friction-cone 32 in such a degree as to overcome the resistance ofthe spring 37.

The barrel or hub 14 is interiorly screwthreaded at its ends, asindicated at 51, which threads cooperate with threads 52 on the ring 25and at its other end with the threads 53 on the cup-shaped nut 30.

The operation of my device is as follows: When the bicycle is goingforward, as in ordinary travel, the sprocket-wheel13 moves in thedirection indicated by the arrow in Figs. 1 and 2. The sprocket-wheelis, practically speaking, fixed to the outer end of the spindle 20. Thethreads 26 on said spindle move in response to the rotation of thesprocketwheel 13, and as they cooperate with the threads 27 within thering 28 this causes the movable member 28 to overcome the resistance ofthe spring 56, and the serrations 61 on the ring 25 grip thelast-mentioned serrations firmly, and thus the ring 28 and the ring 25rotate as one piece with the sprocket-wheel. The operation of the partsbeing reversed, as by back-pedaling, the sprocket-wheel revolves in thedirection opposite to the arrows. The spindle 20 turns in the samedirection, and the threads 26 thereon, by means of the threads 27 inthering 28, cause the latter to move longitudinally toward the malefrictioncone 32 and by means of their adjacent serrated edges 50 and 49to clutch or grip the same and to press same firmly into the femalefriction-cone 31.

Fig. 2 shows the position of the parts when the brake is in itseffective position for braking purposes. \Vhen the brake is not inoperation, but the machine is being propelled by the pedals, the ring28, instead of being in engagement with cone 32, as shown in Fig. 2,will be in engagement with ring 25. In both cases the engagement iseffected by means of the serrations upon the edges of the respectivepieces. This makes am uch firmer contact than an ordinary frictionalcontact and is practically a clutch from which the engaging piecescannot escape until the actuating force is removed.

When the pedals are not being operated to shown as a propel the bicyclenor hacked to brake the same, as in coasting, a single backward push onthe pedals ll separates ring 28 from ring 25, or the same will beaccomplished by the momentum of the wheel (5 upon merely ceasing topedal, and the spring 56 causes ring 28 to remain disengaged from ring25 and to ride free.

I am aware that many minor changes may be made in the form andarrangement of the parts of my invention without departing from thenature and spirit thereof as defined in the claims.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a bicycle-brake, a pair of sprocketwheels, a sprocket-chainengaging same, a threaded member to which one of said sprocket-wheels issecured, a serrated member encircling said threaded member, a ringserrated upon both sides and interiorly threaded with threadscorresponding with said threaded member, a friction-cone having itsinner end serrated, and a hub provided with a cooperating concavebearing-surface.

2. In a bicycle-brake, the combination with the hub provided with aconcave bearing-surface, a notched member secured to the opposite end ofthe hub, and the axle of a threaded spindle journaled on the axle, of amovable member provided with interiorlyarranged threads correspondingwith the threads on said spindle, a sleeve secured to the axle, and abrake member movable on the said sleeve and having its inner endserrated, substantially as described.

3. The combination with the axle,of a spindle revolubly mounted on theaxle and provided with exterior threads, a sprocket-wheel rigidlysecured to the outer end of the said spindle, a hub, a ring secured tothe hub and having its inner edge serrated, a hollow cylinder journaledon the said axle, a frictioncone slidably mounted on the said cylinder,and having its inner end serrated, a coopcrating friction-surfacecarried by the hub, and a movable member having its opposite edgesserrated, said movable member being provided with interior screw-threadsengaging the thread of the said spindle, substantially as described.

at. In a bicycle-brake, the combination with the wheel-axle and thesprocket-wheel, of a threaded spindle revolubly mounted upon the axle,said sprocket-wheel being rigidly secured to the said spindle, a hub, aring secured to the hub, a movable member provided with aninteriorly-threaded portion in engagement with the threads of the saidspindle and having its opposite edges serrated, and a slidablefriction-cone having its inner edge serrated, which edge is engaged bythe said ring when the said axle is revolved rearwardly.

5. In a bicycle-brake, the combination of sprocket-Wheels andsprocket-chain, an axle,

a hub, friction members encircling said axle, one of which has its inneredge serrated, a threaded spindle upon which the rear sprocket-wheel ismounted, a serrated ring secured to the hub, a movable member travelingon said spindle, the same being screwthreaded internally and notched onits edges, and being located between said friction members and saidserrated ring.

6. In a bicycle-brake, the combination of the sprocket-wheel, an axle, ahub having a concave bearing-surface, an externallyscrew-threadedspindle upon which the said sprocket-wheel is mounted, a movable membermounted on said spindle, said member being internally screw-threaded,and provided on its opposite edges with serrations, a ring rigidlysecured to the hub and having its inner edge serrated, and a stationarycone cooperating with the bearing-face of the said hub, said cone havingitsinner edge serrated.

7. In a bicycle-brake, the combination with the vehicle-hub, asprocket-wheel and axle, of a spindle journaled on the shaft, and havingits outer end rigidly secured to the said sprocket-wheel, a ringencircling the said spindle and being secured to the said hub, said ringhaving its inner face serrated, a member slidably mounted on saidspindle and having its opposite edges serrated, a hollow cylindersecured to the said axle, a frictioncone slidably mounted on saidcylinder and having its inner end serrated, and a nut secured to thesaid hub and provided with an interior friction-surface to be engaged bythe said cone.

8. In a bicycle-brake, the combination. of sprocket-wheels, an axle, astationary friction-cone, a nut secured to the said hub and providedwith a conical bearing-surface, a spindle connected with the rearsprocketwheel, a member notched on both sides alternately operated ineither direction by said spindle, and a serrated ring upon one side ofsaid movable member, said ring being secured to the vehicle-hub.

9. In a bicycle-brake, the combination of sprocket-wheels, an axle, aspindle connected to the rear sprocket-wheel, and provided with exteriorthreads, a threaded serrated member mounted on said spindle andalternately operatable in either direction, a serrated ring upon oneside of said movable member, a notched friction-cone upon the other sideof said movable member, and a friction member secured to the said hubcooperating with the said cone when the brake is operating.

10. In a bicycle-brake, the combination with the hub, and the axle journaled therein, of a spindle loosely mounted upon the axle, and havingits exterior provided with screwthreads, a sprocket-wheel secured to theouter end of the spindle, a ring detachably secured to the hub, andhaving its inner edge serrated, a movable member having its interiorscrewthreaded and in engagement with the screw- &

threads of the said spindle, and having its opposite edges serrated, acylindrical sleeve secured to the said axle, and cooperating brakemembers, one of which is secured to the hub, and the other movable onthe said sleeve and having its inner edge serrated, substantially asdescribed.

In testimony whereof I have hereunto set myhand, in the presence of twowitnesses, this 15th day of November, 1901.

JOHN HURCK.

. Witnesses: HUGH K. WAGNER, FAY CHAMBERLAIN.

